Unable to open anything on Windows 7 desktop due to virus

i have a virus that won't let me open anything on my desktop,turn on my virus protection or download any programs to help me. i tried allot of stuff that is on this site and im still having troubles. i have win 7 can anyone help me or should i just take it to a shop. also my ie explorer wont open instead i have this explorer (64 bit) that opens my internet. please let me know

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